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Citation: YANG Jing, LIU Ya-Fei, CHEN Xiao-Mei, HU Zhong-Hua, ZHAO Guo-Hua. Carbon Electrode Material with High Densities of Energy and Power[J]. Acta Physico-Chimica Sinica, ;2008, 24(01): 13-19. doi: 10.1016/S1872-1508(08)60002-9 shu

Carbon Electrode Material with High Densities of Energy and Power

1.
Department of Chemistry, Tongji University, Shanghai 200092, P. R. China

Received Date: 5 July 2007
Available Online: 24 October 2007

Activated carbon (AC) samples as electrode materials were prepared by means of simultaneous physical-chemical activation using walnut shells as precursors. The porosity and surface chemistry of the resultant AC samples were studied by the nitrogen adsorption at 77 K and FTIR spectrum. The testing supercapacitors were assembled with resultant carbon electrode and electrolyte of 6 mol·L-1 KOHsolution. Their electrochemical properties were investigated by charge-discharge of constant current, cyclic voltammogram, impedance spectrumand so on. The results showed that the capacitor had low inner resistance, low leakage current, high stability, and capacitance retainability. The specific capacitance of AC increased with increasing BET specific surface area. The specific capacitance of the AC sample with a specific area of 1197 m2·g-1 could be as high as 292 F·g-1. At a discharge current of 80 mA, the corresponding specific energy density, power density, and maximum power of the supercapacitor are 7.3 Wh·kg-1, 770 W·kg-1, and 5.1 W·g-1, respectively.
- Activated carbon,
- Activation,
- Functional group,
- Electrode material,
- Supercapacitor
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